EP1550803B1 - Prime mover controller of construction machine - Google Patents
Prime mover controller of construction machine Download PDFInfo
- Publication number
- EP1550803B1 EP1550803B1 EP02807861A EP02807861A EP1550803B1 EP 1550803 B1 EP1550803 B1 EP 1550803B1 EP 02807861 A EP02807861 A EP 02807861A EP 02807861 A EP02807861 A EP 02807861A EP 1550803 B1 EP1550803 B1 EP 1550803B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotation speed
- prime mover
- mode
- operating member
- construction machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K25/00—Auxiliary drives
- B60K25/04—Auxiliary drives from static or dynamic pressure or vacuum, developed by the engine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
- E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4061—Control related to directional control valves, e.g. change-over valves, for crossing the feeding conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/46—Automatic regulation in accordance with output requirements
- F16H61/465—Automatic regulation in accordance with output requirements for achieving a target input speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
- B60W10/101—Infinitely variable gearings
- B60W10/103—Infinitely variable gearings of fluid type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S180/00—Motor vehicles
- Y10S180/90—Argicultural-type tractors
Definitions
- the present invention relates to a prime mover control device of a construction machine that is capable of changing a rotation speed of a prime mover in accordance with an operation amount.
- Control devices of this type known in the related art include the one disclosed in Japanese Patent Registration No. 2634330 .
- the device disclosed in this publication sets a rotation speed according to an operation amount of a rotation speed setting unit (a fuel lever) and a rotation speed according to an extent to which a travel pedal is operated, and selects a maximum value as a target rotation speed.
- a lowest value of the target rotation speed is restricted to a rotation speed in correspondence to an operation amount of the rotation speed setting unit so that if a rotation speed setting is set by the rotation speed setting unit to a value suitable for working (e.g., excavation), it is possible to minimize a fluctuation in the engine rotation speed and to improve the operability.
- the prime mover rotation speed changes in accordance with the operation amount of the travel pedal, and thus the improvement of the fuel efficiency and the noise reduction can be achieved.
- An object of the present invention is to provide a prime mover control device of a construction machine with which a traveling speed can be adjusted with ease.
- the present invention is adopted in a prime mover control device of a construction machine having a hydraulic pump driven by a prime mover, an actuator driven with pressure oil discharged from the hydraulic pump, and a control valve that controls a flow of the pressure oil from the hydraulic pump to the actuator in response to an operation of a first operating member.
- the prime mover control device includes a first set means for setting a first set rotation speed of the prime mover according to the operation of the first operating member, a second set means for setting a second set rotation speed of the prime mover according to an operation of a second operating member, and a selection member that selects one of a first mode and a second mode.
- the invention is characterized by the further inclusion in the prime mover control device of a rotation speed control means for controlling a prime mover rotation speed adapted to match with a maximum value between the first set rotation speed and the second set rotation speed when the selection member selects the first mode, and for controlling the prime mover rotation speed adapted to match with the second set rotation speed when the selection member selects the second mode.
- Another prime mover control device of the construction machine includes a first set means for setting a first set rotation speed of the prime mover according to the operation of the first operating member, a second set means for setting a second set rotation speed of the prime mover according to an operation of a second operating member, a selection member that selects one of a first mode and a second mode, and a rotation speed control means for controlling a prime mover rotation speed to match with the first set rotation speed when the selection member selects the first mode, and for controlling the prime mover rotation speed to match with the second set rotation speed when the selection member selects the second mode.
- the drive speed of the actuator can be changed in accordance with the operation amount of the second operating member while the first operating member is operated to the maximum extent in the second mode, the speed of the actuator can be adjusted with ease.
- the first operating member is a foot-operated operating member
- the second operating member is a hand-operated operating member
- the selection member is installed in the vicinity of the second operating member.
- the actuator may be a traveling motor.
- the first set rotation speed may be set to a larger value compared to a value to be set when the work state is determined.
- the traveling state may be determined when the non-operating state of the brake and the neutral operation are detected.
- the present invention is ideal in an application in a wheeled hydraulic excavator.
- the wheeled hydraulic excavator includes an undercarriage 1 and a revolving superstructure 2 rotatably mounted atop the undercarriage 1.
- An operator's cab 3 and a work front attachment 4 constituted with a boom 4a, an arm 4b and a bucket 4c are provided at the revolving superstructure 2.
- the boom 4a is raised/lowered as a boom cylinder 4d is driven, the arm 4b is raised/lowered as an arm cylinder 4e is driven and the bucket 4c is engaged in a dig/dump operation as a bucket cylinder 4f is driven.
- a traveling motor 5, which is hydraulically driven, is provided at the undercarriage 1, and the rotation of the traveling motor 5 is transmitted to wheels 6 (tires) via a drive shaft and an axle.
- FIG. 2 is a circuit diagram of a traveling hydraulic circuit in the wheeled hydraulic excavator shown in FIG. 1 .
- This hydraulic circuit includes a main pump 24 driven by a prime mover 10, the traveling motor 5 driven with pressure oil form the main pump 24, a control valve 25 that controls a flow of the pressure oil from the main pump 24 to the traveling motor 5, a pilot pump 21, a pilot valve 22 driven via a foot-operated travel pedal 22a, and a forward/backward switching valve 23 that is switched to a forward position, a backward position or a neutral position in response to an operation of a forward/backward selector switch (not shown) .
- a pilot pressure originating from the pilot pump 21 is applied to the control valve 25.
- the pressure oil from the main pump 24 is applied to the traveling motor 5 via the control valve 25 and the traveling motor 5 rotates, thereby causing the vehicle to travel forward or backward.
- a pressure sensor 31 is connected to the pilot valve 22 and a pilot pressure Pt is detected as a travel command with the pressure sensor 31.
- FIG. 3 shows a hydraulic circuit for the boom cylinder, representing an example of a work hydraulic circuit.
- This hydraulic circuit includes a main pump 26, the boom cylinder 4d that is caused to extend/contract by pressure oil from the main pump 26, a control valve 27 that controls the flow of the pressure oil from the main pump 26 to the boom cylinder 4d, the pilot pump 21 and a pilot valve 28 driven via an operating lever 28a.
- hydraulic circuits of the other actuators for actuating the front attachment are similar to that described above.
- the pilot valve 28 In response to an operation of the operating lever 28a, the pilot valve 28 is driven in correspondence to the extent to which the operating lever 28a has been operated and a pilot pressure from the pilot pump 21 is applied to the control valve 27.
- a pilot pressure from the pilot pump 21 is applied to the control valve 27.
- the pressure oil from the main pump 26 is guided to the boom cylinder 4d via the control valve 27 and, as the boom cylinder 4d extends/contracts, the boom 4a is raised/lowered.
- the hydraulic circuit may dispense with the main pump 26 and, in such a case, the cylinder 4d can be driven with the pressure oil from the main pump 24.
- the engine rotation speed is controlled to adjust a delivery flow rate from the pump in a pedal mode (a first mode) or in a dial mode (a second mode) to be detailed later, so as to adjust the vehicle speed.
- FIG. 4 is a block diagram of a control circuit that controls the rotation speed of the engine.
- a governor lever 11 of an engine 10 is connected to a pulse motor 13 via a link mechanism 12 and the engine rotation speed is adjusted with the rotation of the pulse motor 13. Namely, the engine rotation speed increases as the pulse motor 13 rotates forward, and the engine rotation speed decreases with a reverse rotation of the pulse motor 13.
- a potentiometer 14 is connected to the governor lever 11 via the link mechanism 12, and the governor lever angle corresponding to the rotation speed of the engine 10, which is detected with the potentiometer 14, is input to the control circuit 30 as an engine control rotation speed N ⁇ .
- the control circuit 30 is connected with the pressure sensor 31 that detects the pilot pressure Pt corresponding to the extent to which the travel pedal 22a is operated, a brake switch 32, a position sensor 33 that detects the position to which the forward/backward switching valve 23 is switched, a manual or hand-operated set dial 34 that issues a signal for setting the engine rotation speed in accordance with an extent X to which the dial is turned, and a change-over switch 35 that changes over between the pedal mode and the dial mode selectively.
- a work or traveling signal is output from the brake switch 32.
- a parking brake is canceled and the operation of a service brake is enabled through a brake pedal.
- the parking brake and the service brake are both engaged.
- the parking brake is engaged.
- the brake switch 32 is switched to the traveling position, it outputs an off signal, whereas it outputs an on signal when it is switched to the work or parking position.
- the set dial 34 is installed in an operation panel in the vicinity of an operator's seat so as to be operatable during traveling.
- the change-over switch 35 is disposed adjacent to the set dial 34 so as to enable the operator to operate the change-over switch 35 without leaving his hand from the set dial 34.
- FIG. 7 One example of arrangement of the set dial 34 and the change-over switch 35 is shown in FIG. 7 .
- the rotation speed control circuit 30 executes the following arithmetic operation and outputs a control signal to the pulse motor 13.
- FIG. 5 is a conceptual diagram illustrating in detail the rotation speed control circuit 30.
- the relationships between the detection value Pt provided by the pressure sensor 31 and a target rotation speed Nt and between the detection value Pt and a target rotation speed Nd are stored in memory in advance at rotation speed calculation units 41 and 42 respectively as shown in the figure, and the target rotation speeds Nt and Nd matching the extent to which the travel pedal 22a is operated are individually calculated based upon the characteristics of these relationships.
- the characteristics stored in memory at the rotation speed calculation unit 41 are the characteristics suited for traveling, whereas the characteristics stored in memory at the rotation speed calculation unit 42 are the characteristics suited for work performed by using the work attachment 4.
- the target rotation speed Nt increases in a steeper slope compared to the target rotation speed Nd, and a maximum value Ntmax of the target rotation speed Nt is greater than a maximum value Ndmax of the target rotation speed Nd.
- a selection unit 44 selects one of the target rotation speeds Nt and Nd provided by the rotation speed calculation units 41 and 42, based upon the signals provided from the brake switch 32, the position sensor 33 and the pressure sensor 31. If the brake switch 32 has been switched to the traveling position (an off signal is output), the forward/backward switching valve 23 is set at a position other than the neutral position and the pilot pressure Pt representing the extent of the operation of the travel pedal 22a is equal to or greater than a predetermined value, i. e., if the vehicle is traveling, the target rotation speed Nt is selected, and the target rotation speed Nd is selected otherwise, i.e., under non-traveling conditions.
- a maximum value selection unit 45 compares the target rotation speed Nt or Nd selected by the selection unit 44 with the target rotation speed Nx calculated at the rotation speed calculation unit 43 and selects the larger value as Nmax.
- a mode change unit 46 selects either the target rotation speed Nmax selected at the maximum value selection unit 45 or the target rotation speed Nx calculated at the rotation speed calculation unit 43, based upon the signal provided from the change-over switch 35.
- the target rotation speed Nmax is selected when the change-over switch 35 is switched to the pedal mode
- the target rotation speed Nx is selected when the change-over switch 35 is switched to the dial mode.
- a servo control unit 47 compares the rotation speed (the rotation speed command value Nin) selected at the mode change unit 46 with the control rotation speed N N ⁇ corresponding to the displacement quantity of the governor lever 11 detected with the potentiometer 14. Then, it controls the pulse motor 13 through the procedure shown in FIG. 6 so as to match the two values.
- step S21 the rotation speed command value Nin and the control rotation speed N ⁇ are individually read in step S21 before proceeding to step S22 in FIG. 6 .
- step S22 the results of subtracting Nin from N ⁇ are stored as a rotation speed difference A in memory, and in step S23, a decision is made as to whether or not
- the control rotation speed N ⁇ is greater than the rotation speed command value Nin, i.e., the control rotation speed is higher than the target rotation speed and, accordingly, a signal constituting a command for a motor reverse rotation is output to the pulse motor 13 in step S25 in order to lower the engine rotation speed.
- the pulse motor 13 rotates in the reverse direction, thereby lowering the engine rotation speed.
- step S26 a signal constituting a command for a motor forward rotation is output in step S26 in order to raise the engine rotation speed.
- the pulse motor 13 rotates forward, thereby raising the engine rotation speed.
- step S27 the operation proceeds to step S27 to output a motor stop signal and, as a result, the engine rotation speed is sustained at a constant level.
- the pedal mode is selected with the change-over switch 35.
- the engine rotation speed can be set in accordance with the operation of the travel pedal 22a and thus, the pedal mode is suitable for a normal travel during which a maximum torque may be generated.
- the brake switch 32 is set to the traveling position and the forward/backward selector switch is set to the forward position or the backward position when the vehicle is to travel.
- the control valve 25 is switched in correspondence to the extent of the pedal operation and the traveling motor 5 is caused to rotate by the pressure oil from the main pump 24.
- the target rotation speed Nt is selected through the arithmetic operation in the selection unit 44 of the control circuit 30, and the target rotation speed Nt is again selected in the maximum value selection unit 45.
- the target rotation speed Nt is set as the rotation speed command value Nin, and with the signal outputted through the servo control to the pulse motor 13, control is implemented to set the engine rotation speed equal to the target rotation speed Nt.
- the engine rotation speed is adjusted in conformance to the characteristics suitable for traveling stored in memory at the rotation speed calculation unit 41. As a result, an improvement in fuel efficiency and the noise reduction can be achieved as well as achieving desirable acceleration.
- the brake switch 32 To engage the vehicle in work in a state where the vehicle remains stopping, the brake switch 32 is set to the work position and the forward/backward selector switch is set to the neutral position. As the operating lever 28a is operated in this state, the control valve 27 is switched in correspondence to the extent to which the operating lever 28a is operated, thereby driving the boom cylinder 4d.
- the selection unit 44 selects the target rotation speed Nd and the maximum value selection unit 45 selects a larger value between the target rotation speed Nd and the target rotation speed Nx set by the set dial 34. Accordingly, by setting the target rotation speed Nx with the set dial 34 to a suitable value for the particular nature of work to be undertaken, a fluctuation of the engine rotation speed can be suppressed regardless of the operation of the travel pedal 22a and the excellent workability can be obtained.
- the dial mode is selected with the change-over switch 35.
- the engine rotation speed is set through the operation of the set dial 34 regardless of the operation of the travel pedal 22a, and the engine rotation speed is adjusted to the value set via the set dial 34 while no rotation speed is selected at the selection units 44 and 45 with reference to Fig. 5 .
- the engine rotation speed is set via the set dial 34 and when the travel pedal 22a is depressed, only an extent to which the control valve 25 is switched changes to adjust the speed without changing the engine rotation speed.
- a speed based upon a maximum delivery flow rate of the main pump 24 corresponding to the set engine rotation speed can be set as a maximum speed, thereby making the dial mode suitable for a case where the travel speed should be limited below a predetermined level or for a case where the vehicle travels at a constant speed.
- the target rotation speed Nx set via the set dial 34 is selected at the mode change unit 46 in the dial mode, and the target rotation speed Nx is set as the rotation speed command value Nin.
- the engine rotation speed is controlled to the target rotation speed Nx regardless of the operation of the travel pedal 22a. Namely, the delivery flow rate of the pump changes according to the extent to which the dial is turned.
- the pressure oil according to the target rotation speed Nx is supplied to the traveling motor 5 so as to enable the maximum speed of the vehicle to be regulated in accordance with the operation of the set dial 34.
- the maximum travel speed rises as the engine rotation speed increases due to increase in the extent to which the dial is operated, whereas the maximum travel speed is lowered as the engine rotation speed decreases due to decrease in the dial operation amount.
- the vehicle can travel at a constant speed which is set at will while the travel pedal 22a is depressed to the maximum extent. As a result, there is no need for the operator to adjust the pedal operation amount, thereby reducing the burden on the operator.
- the control circuit may dispense with the target rotation speed calculation unit 42.
- the change-over switch 35 constitutes a selection means
- an operation member other than the switch for instance a dial
- the set dial 34 constitutes a second set member
- an operation member other than the dial for instance a push button switch or a slide switch which moves straight
- a travel state is determined based upon the signals from the brake switch 32 and the position sensor 33 working as a determination means, the travel state may be determined using, for instance a vehicle speed sensor.
- the maximum value selection unit 45 may be omitted as shown in FIG. 8 .
- the engine rotation speed can be set in accordance with the operation of the travel pedal 22a regardless of the operation of the set dial 34 in the pedal mode, and the engine rotation speed can be set in accordance with the operation of the set dial 34 in the dial mode. That is, a separate engine control can be executed by using either the travel pedal 22a or the set dial 34.
- a first operating member is also not limited to the travel pedal 22a.
- a wheeled hydraulic excavator represents an example of a construction machine in which the present invention may be adopted
- the present invention may also be adopted in other types of construction machines such as non-wheel construction machines.
Abstract
Description
- The present invention relates to a prime mover control device of a construction machine that is capable of changing a rotation speed of a prime mover in accordance with an operation amount.
- Control devices of this type known in the related art include the one disclosed in Japanese Patent Registration No.
2634330 - The device disclosed in this publication sets a rotation speed according to an operation amount of a rotation speed setting unit (a fuel lever) and a rotation speed according to an extent to which a travel pedal is operated, and selects a maximum value as a target rotation speed. As a result, a lowest value of the target rotation speed is restricted to a rotation speed in correspondence to an operation amount of the rotation speed setting unit so that if a rotation speed setting is set by the rotation speed setting unit to a value suitable for working (e.g., excavation), it is possible to minimize a fluctuation in the engine rotation speed and to improve the operability. Moreover, by setting the rotation speed setting at the rotation speed setting unit to the idling rotation speed during traveling, the prime mover rotation speed changes in accordance with the operation amount of the travel pedal, and thus the improvement of the fuel efficiency and the noise reduction can be achieved.
- When utilizing the device disclosed in the above mentioned publication, it is necessary to maintain the travel pedal at a position depressed halfway down in order for a vehicle, for example, to travel at a constant speed since the traveling speed of the vehicle is adjusted by adjusting the operation amount of the travel pedal. However, it is a burden on an operator to keep the travel pedal at the halfway-down position.
- It is also known from applicant's United States patent publication
US 5,155,996 to have a hydraulic drive system for a construction machine that includes a hydraulic pump, an actuator, a control valve, and a first operating element in the form of a fuel lever. - Document
US 5,155,996 discloses a control device according to the preamble of claim 1. - An object of the present invention is to provide a prime mover control device of a construction machine with which a traveling speed can be adjusted with ease.
- This object is achieved by a control device according to the technical features, in combination, of independent claim 1.
- The present invention is adopted in a prime mover control device of a construction machine having a hydraulic pump driven by a prime mover, an actuator driven with pressure oil discharged from the hydraulic pump, and a control valve that controls a flow of the pressure oil from the hydraulic pump to the actuator in response to an operation of a first operating member. The prime mover control device includes a first set means for setting a first set rotation speed of the prime mover according to the operation of the first operating member, a second set means for setting a second set rotation speed of the prime mover according to an operation of a second operating member, and a selection member that selects one of a first mode and a second mode. The invention is characterized by the further inclusion in the prime mover control device of a rotation speed control means for controlling a prime mover rotation speed adapted to match with a maximum value between the first set rotation speed and the second set rotation speed when the selection member selects the first mode, and for controlling the prime mover rotation speed adapted to match with the second set rotation speed when the selection member selects the second mode.
- Another prime mover control device of the construction machine according to the present invention includes a first set means for setting a first set rotation speed of the prime mover according to the operation of the first operating member, a second set means for setting a second set rotation speed of the prime mover according to an operation of a second operating member, a selection member that selects one of a first mode and a second mode, and a rotation speed control means for controlling a prime mover rotation speed to match with the first set rotation speed when the selection member selects the first mode, and for controlling the prime mover rotation speed to match with the second set rotation speed when the selection member selects the second mode.
- Accordingly, since the drive speed of the actuator can be changed in accordance with the operation amount of the second operating member while the first operating member is operated to the maximum extent in the second mode, the speed of the actuator can be adjusted with ease.
- It is preferable that the first operating member is a foot-operated operating member, and the second operating member is a hand-operated operating member.
- It is preferable that the selection member is installed in the vicinity of the second operating member. The actuator may be a traveling motor.
- When the traveling state is determined by determining whether the traveling state or work state, the first set rotation speed may be set to a larger value compared to a value to be set when the work state is determined. The traveling state may be determined when the non-operating state of the brake and the neutral operation are detected.
- The present invention is ideal in an application in a wheeled hydraulic excavator.
-
-
FIG. 1 is an external view of a wheeled hydraulic excavator in which the present invention is adopted; -
FIG. 2 is a circuit diagram of a hydraulic circuit for traveling in the wheeled hydraulic excavator inFIG. 1 ; -
FIG. 3 is a circuit diagram of a work hydraulic circuit in the wheeled hydraulic excavator inFIG. 1 ; -
FIG. 4 is a block diagram of a prime mover control device achieved in an embodiment of the present invention; -
FIG. 5 shows in detail a control circuit inFIG. 4 ; -
FIG. 6 presents a flow chart a procedure for controlling the engine rotation speed; -
FIG. 7 shows one example of arrangement of a set dial and a change-over switch; and -
FIG. 8 shows a variation example ofFIG. 5 . - The first embodiment achieved by adopting a prime mover control device according to the present invention in a wheeled hydraulic excavator is explained in reference to
FIGS. 1 through 6 . - As shown in
FIG. 1 , the wheeled hydraulic excavator includes an undercarriage 1 and a revolvingsuperstructure 2 rotatably mounted atop the undercarriage 1. An operator'scab 3 and awork front attachment 4 constituted with a boom 4a, an arm 4b and a bucket 4c are provided at the revolvingsuperstructure 2. The boom 4a is raised/lowered as aboom cylinder 4d is driven, the arm 4b is raised/lowered as anarm cylinder 4e is driven and the bucket 4c is engaged in a dig/dump operation as a bucket cylinder 4f is driven. A travelingmotor 5, which is hydraulically driven, is provided at the undercarriage 1, and the rotation of the travelingmotor 5 is transmitted to wheels 6 (tires) via a drive shaft and an axle. -
FIG. 2 is a circuit diagram of a traveling hydraulic circuit in the wheeled hydraulic excavator shown inFIG. 1 . This hydraulic circuit includes amain pump 24 driven by aprime mover 10, the travelingmotor 5 driven with pressure oil form themain pump 24, acontrol valve 25 that controls a flow of the pressure oil from themain pump 24 to the travelingmotor 5, apilot pump 21, apilot valve 22 driven via a foot-operated travel pedal 22a, and a forward/backwardswitching valve 23 that is switched to a forward position, a backward position or a neutral position in response to an operation of a forward/backward selector switch (not shown) . - As the forward/backward
switching valve 23 is set to the forward position or the backward position through a switch operation and then the travel pedal 22a is operated, a pilot pressure originating from thepilot pump 21 is applied to thecontrol valve 25. In response, the pressure oil from themain pump 24 is applied to the travelingmotor 5 via thecontrol valve 25 and the travelingmotor 5 rotates, thereby causing the vehicle to travel forward or backward. Apressure sensor 31 is connected to thepilot valve 22 and a pilot pressure Pt is detected as a travel command with thepressure sensor 31. -
FIG. 3 shows a hydraulic circuit for the boom cylinder, representing an example of a work hydraulic circuit. This hydraulic circuit includes amain pump 26, theboom cylinder 4d that is caused to extend/contract by pressure oil from themain pump 26, acontrol valve 27 that controls the flow of the pressure oil from themain pump 26 to theboom cylinder 4d, thepilot pump 21 and apilot valve 28 driven via an operating lever 28a. It is to be noted that although not shown, hydraulic circuits of the other actuators for actuating the front attachment are similar to that described above. - In response to an operation of the operating lever 28a, the
pilot valve 28 is driven in correspondence to the extent to which the operating lever 28a has been operated and a pilot pressure from thepilot pump 21 is applied to thecontrol valve 27. As a result, the pressure oil from themain pump 26 is guided to theboom cylinder 4d via thecontrol valve 27 and, as theboom cylinder 4d extends/contracts, the boom 4a is raised/lowered. It is to be noted that the hydraulic circuit may dispense with themain pump 26 and, in such a case, thecylinder 4d can be driven with the pressure oil from themain pump 24. - In this embodiment, the engine rotation speed is controlled to adjust a delivery flow rate from the pump in a pedal mode (a first mode) or in a dial mode (a second mode) to be detailed later, so as to adjust the vehicle speed.
-
FIG. 4 is a block diagram of a control circuit that controls the rotation speed of the engine. Agovernor lever 11 of anengine 10 is connected to apulse motor 13 via alink mechanism 12 and the engine rotation speed is adjusted with the rotation of thepulse motor 13. Namely, the engine rotation speed increases as thepulse motor 13 rotates forward, and the engine rotation speed decreases with a reverse rotation of thepulse motor 13. Apotentiometer 14 is connected to thegovernor lever 11 via thelink mechanism 12, and the governor lever angle corresponding to the rotation speed of theengine 10, which is detected with thepotentiometer 14, is input to thecontrol circuit 30 as an engine control rotation speed Nθ. - The
control circuit 30 is connected with thepressure sensor 31 that detects the pilot pressure Pt corresponding to the extent to which the travel pedal 22a is operated, abrake switch 32, aposition sensor 33 that detects the position to which the forward/backwardswitching valve 23 is switched, a manual or hand-operatedset dial 34 that issues a signal for setting the engine rotation speed in accordance with an extent X to which the dial is turned, and a change-over switch 35 that changes over between the pedal mode and the dial mode selectively. - As the
brake switch 32 is switched to a traveling position, a work position or a parking position, a work or traveling signal is output from thebrake switch 32. When thebrake switch 32 is switched to the traveling position, a parking brake is canceled and the operation of a service brake is enabled through a brake pedal. As thebrake switch 32 is switched to the work position, the parking brake and the service brake are both engaged. When it is switched to the parking position, the parking brake is engaged. As thebrake switch 32 is switched to the traveling position, it outputs an off signal, whereas it outputs an on signal when it is switched to the work or parking position. - The
set dial 34 is installed in an operation panel in the vicinity of an operator's seat so as to be operatable during traveling. The change-over switch 35 is disposed adjacent to theset dial 34 so as to enable the operator to operate the change-overswitch 35 without leaving his hand from theset dial 34. One example of arrangement of theset dial 34 and the change-overswitch 35 is shown inFIG. 7 . - The rotation
speed control circuit 30 executes the following arithmetic operation and outputs a control signal to thepulse motor 13. -
FIG. 5 is a conceptual diagram illustrating in detail the rotationspeed control circuit 30. The relationships between the detection value Pt provided by thepressure sensor 31 and a target rotation speed Nt and between the detection value Pt and a target rotation speed Nd are stored in memory in advance at rotationspeed calculation units speed calculation unit 41 are the characteristics suited for traveling, whereas the characteristics stored in memory at the rotationspeed calculation unit 42 are the characteristics suited for work performed by using thework attachment 4. These characteristics indicate linear increases in the target rotation speeds Nt and Nd from the idling rotation speed Ni as the extent of pedal operation increases. The target rotation speed Nt increases in a steeper slope compared to the target rotation speed Nd, and a maximum value Ntmax of the target rotation speed Nt is greater than a maximum value Ndmax of the target rotation speed Nd. - As shown in the figure, the relationship between the extent X to which the
set dial 34 is operated and a target rotation speed (rotation speed setting) Nx is stored in memory in advance at a rotationspeed calculation unit 43 as shown in the figure, and the target rotation speed Nx corresponding to the dial operation extent X is calculated based upon the characteristics of the relationship. It is to be noted that a maximum value Nxmax of the target rotation speed Nx is set equal to the maximum value Ndmax at the rotation speed calculation unit 42 (Nxmax = Ndmax). - A
selection unit 44 selects one of the target rotation speeds Nt and Nd provided by the rotationspeed calculation units brake switch 32, theposition sensor 33 and thepressure sensor 31. If thebrake switch 32 has been switched to the traveling position (an off signal is output), the forward/backward switchingvalve 23 is set at a position other than the neutral position and the pilot pressure Pt representing the extent of the operation of the travel pedal 22a is equal to or greater than a predetermined value, i. e., if the vehicle is traveling, the target rotation speed Nt is selected, and the target rotation speed Nd is selected otherwise, i.e., under non-traveling conditions. - A maximum
value selection unit 45 compares the target rotation speed Nt or Nd selected by theselection unit 44 with the target rotation speed Nx calculated at the rotationspeed calculation unit 43 and selects the larger value as Nmax. - A
mode change unit 46 selects either the target rotation speed Nmax selected at the maximumvalue selection unit 45 or the target rotation speed Nx calculated at the rotationspeed calculation unit 43, based upon the signal provided from the change-over switch 35. The target rotation speed Nmax is selected when the change-over switch 35 is switched to the pedal mode, and the target rotation speed Nx is selected when the change-over switch 35 is switched to the dial mode. - A
servo control unit 47 compares the rotation speed (the rotation speed command value Nin) selected at themode change unit 46 with the control rotation speed N Nθ corresponding to the displacement quantity of thegovernor lever 11 detected with thepotentiometer 14. Then, it controls thepulse motor 13 through the procedure shown inFIG. 6 so as to match the two values. - First, the rotation speed command value Nin and the control rotation speed Nθ are individually read in step S21 before proceeding to step S22 in
FIG. 6 . Then, in step S22, the results of subtracting Nin from Nθ are stored as a rotation speed difference A in memory, and in step S23, a decision is made as to whether or not |A| ≧ K is true with regard to the rotation speed difference A and a predetermined reference rotation speed difference K. If an affirmative decision is made, the operation proceeds to step S24 to decide whether or not the rotation speed difference A is greater than 0. If A > 0, the control rotation speed Nθ is greater than the rotation speed command value Nin, i.e., the control rotation speed is higher than the target rotation speed and, accordingly, a signal constituting a command for a motor reverse rotation is output to thepulse motor 13 in step S25 in order to lower the engine rotation speed. In response, thepulse motor 13 rotates in the reverse direction, thereby lowering the engine rotation speed. - If, on the other hand, A ≦ 0, the control rotation speed Nθ is lower than the rotation speed command value Nin, i. e. , the control rotation speed is lower than the target rotation speed and, accordingly, a signal constituting a command for a motor forward rotation is output in step S26 in order to raise the engine rotation speed. In response, the
pulse motor 13 rotates forward, thereby raising the engine rotation speed. If a negative decision is made in step S23, the operation proceeds to step S27 to output a motor stop signal and, as a result, the engine rotation speed is sustained at a constant level. Once the processing in one of steps S25 through S27 is executed, the operation returns to the start point. - Next, the operation that characterizes the prime mover control device achieved in this embodiment is explained.
- First, explanation is given in the case where the pedal mode is selected with the change-
over switch 35. By selecting the pedal mode, the engine rotation speed can be set in accordance with the operation of the travel pedal 22a and thus, the pedal mode is suitable for a normal travel during which a maximum torque may be generated. - The
brake switch 32 is set to the traveling position and the forward/backward selector switch is set to the forward position or the backward position when the vehicle is to travel. As the travel pedal 22a is depressed in this state, thecontrol valve 25 is switched in correspondence to the extent of the pedal operation and the travelingmotor 5 is caused to rotate by the pressure oil from themain pump 24. - At this time, the target rotation speed Nt is selected through the arithmetic operation in the
selection unit 44 of thecontrol circuit 30, and the target rotation speed Nt is again selected in the maximumvalue selection unit 45. Thus, the target rotation speed Nt is set as the rotation speed command value Nin, and with the signal outputted through the servo control to thepulse motor 13, control is implemented to set the engine rotation speed equal to the target rotation speed Nt. In this situation, the engine rotation speed is adjusted in conformance to the characteristics suitable for traveling stored in memory at the rotationspeed calculation unit 41. As a result, an improvement in fuel efficiency and the noise reduction can be achieved as well as achieving desirable acceleration. - To engage the vehicle in work in a state where the vehicle remains stopping, the
brake switch 32 is set to the work position and the forward/backward selector switch is set to the neutral position. As the operating lever 28a is operated in this state, thecontrol valve 27 is switched in correspondence to the extent to which the operating lever 28a is operated, thereby driving theboom cylinder 4d. - At this time, based upon the arithmetic operation executed at the
control circuit 30, theselection unit 44 selects the target rotation speed Nd and the maximumvalue selection unit 45 selects a larger value between the target rotation speed Nd and the target rotation speed Nx set by theset dial 34. Accordingly, by setting the target rotation speed Nx with theset dial 34 to a suitable value for the particular nature of work to be undertaken, a fluctuation of the engine rotation speed can be suppressed regardless of the operation of the travel pedal 22a and the excellent workability can be obtained. - Next, explanation is given in the case where the dial mode is selected with the change-
over switch 35. In the dial mode, the engine rotation speed is set through the operation of theset dial 34 regardless of the operation of the travel pedal 22a, and the engine rotation speed is adjusted to the value set via theset dial 34 while no rotation speed is selected at theselection units Fig. 5 . In this mode, the engine rotation speed is set via theset dial 34 and when the travel pedal 22a is depressed, only an extent to which thecontrol valve 25 is switched changes to adjust the speed without changing the engine rotation speed. Accordingly, by setting the engine rotation speed to, for example, a predetermined low rotation speed with theset dial 34, a speed based upon a maximum delivery flow rate of themain pump 24 corresponding to the set engine rotation speed can be set as a maximum speed, thereby making the dial mode suitable for a case where the travel speed should be limited below a predetermined level or for a case where the vehicle travels at a constant speed. - The target rotation speed Nx set via the
set dial 34 is selected at themode change unit 46 in the dial mode, and the target rotation speed Nx is set as the rotation speed command value Nin. As a result, the engine rotation speed is controlled to the target rotation speed Nx regardless of the operation of the travel pedal 22a. Namely, the delivery flow rate of the pump changes according to the extent to which the dial is turned. - Accordingly, when depressing the travel pedal 22a to the maximum extent, the pressure oil according to the target rotation speed Nx is supplied to the traveling
motor 5 so as to enable the maximum speed of the vehicle to be regulated in accordance with the operation of theset dial 34. The maximum travel speed rises as the engine rotation speed increases due to increase in the extent to which the dial is operated, whereas the maximum travel speed is lowered as the engine rotation speed decreases due to decrease in the dial operation amount. In this manner, the vehicle can travel at a constant speed which is set at will while the travel pedal 22a is depressed to the maximum extent. As a result, there is no need for the operator to adjust the pedal operation amount, thereby reducing the burden on the operator. - According to this embodiment the following advantages can be achieved.
- (1) The pedal mode or the dial mode is selected according to the operation of the change-
over switch 35. The larger value between the target rotation speed Nt or Nd based upon the pedal operation and the target rotation speed Nx in accordance with the dial operation is selected in the pedal mode, whereas the target rotation speed Nx according to the dial operation is selected in the dial mode. Accordingly, in the dial mode the travel speed of the vehicle when the travel pedal 22a is depressed to the maximum extent is adjusted to the value in accordance with the extent X to which the dial is turned. As a result, the vehicle speed can be adjusted easily so as to allow the vehicle to travel at a constant speed with ease. In the pedal mode the maximum driving torque can be generated, thereby allowing the vehicle to travel at high speed with ease. - (2) The change-
over switch 35 can be operated without releasing an operator's hand from theset dial 34 because the change-over switch 35 is installed in the vicinity of theset dial 34. As a result, constant speed travel and normal travel can be changed over immediately. - (3) The characteristics of the target rotation speed Nt for traveling and the target rotation speed Nd for working are set individually so that an inclination of increase in the target rotation speed Nt for traveling and the maximum rotation speed Ntmax are greater than an inclination of increase in target rotation speed Nd for working and a maximum value Ndmax, respectively. In this manner, excellent acceleration can be achieved during traveling in the pedal mode and the engine rotation speed can be adjusted easily during working since the inclination of the target rotation speed Nd for working is small.
- (4) By detecting a state of traveling and a state of working with the
brake switch 32 and theposition sensor 33 and selecting the target rotation speed Nt or Nd based on the detection result, a special operation for selecting the target rotation speed is not necessary. - It is to be noted that while three target rotation
speed calculation units 41 to 43 are provided in the above-described embodiment, the control circuit may dispense with the target rotationspeed calculation unit 42. While the change-over switch 35 constitutes a selection means, an operation member other than the switch, for instance a dial may be used. While theset dial 34 constitutes a second set member, an operation member other than the dial, for instance a push button switch or a slide switch which moves straight may be used instead. While a travel state is determined based upon the signals from thebrake switch 32 and theposition sensor 33 working as a determination means, the travel state may be determined using, for instance a vehicle speed sensor. - While, in the above embodiment, a maximum value of the target rotation speed Nt or Nd and the target rotation speed Nx is selected at the maximum
value selection unit 45, the maximumvalue selection unit 45 may be omitted as shown inFIG. 8 . In this manner, the engine rotation speed can be set in accordance with the operation of the travel pedal 22a regardless of the operation of theset dial 34 in the pedal mode, and the engine rotation speed can be set in accordance with the operation of theset dial 34 in the dial mode. That is, a separate engine control can be executed by using either the travel pedal 22a or theset dial 34. - While the explanation is given to an example that facilitates the speed adjustment of the traveling
hydraulic motor 5 in the above, the present invention is not to be limited to this example and it may be applied to a revolving hydraulic motor that revolves the revolving superstructure, for example. A first operating member is also not limited to the travel pedal 22a. - While an explanation is given above on an example in which a wheeled hydraulic excavator represents an example of a construction machine in which the present invention may be adopted, the present invention may also be adopted in other types of construction machines such as non-wheel construction machines.
Claims (8)
- A prime mover control device of a construction machine that includes:a hydraulic pump (24) driven by a prime mover (10);an actuator (5) driven with pressure oil discharged from the hydraulic pump (24); anda control valve (25) for controlling a flow of the pressure oil from the hydraulic pump (24) to the actuator (5) in response to an operation of a first operating member (22a), comprising:a first set means (41) for setting a first set rotation speed of the prime mover (10) according to the operation of the first operating member (22a);a second set means (43) for setting a second set rotation speed of the prime mover (10) according to an operation of a second operating member (34); anda selection member (35) for selecting one of a first mode and a second mode; characterized in further comprising:a rotation speed control means (30) for controlling a prime mover rotation speed adapted to match with a maximum value between the first set rotation speed and the second set rotation speed when the selection member (35) selects the first mode, and for controlling the prime mover rotation speed adapted to match with the second set rotation speed when the selection member (35) selects the second mode.
- A prime mover control device of a construction machine according to claim 1, wherein:the rotation speed control means (30) for controlling a prime mover rotation speed is adapted to match with the first set rotation speed regardless of the second set rotation speed when the selection member (35) selects the first mode, and controls the prime mover rotation speed to match with the second set rotation speed when the selection member (35) selects the second mode.
- A prime mover control device of a construction machine according to claim 1 or claim 2, wherein:the first operating member (22a) is a foot-operated operating member, and the second operating member (34) is a hand-operated operating member.
- A prime mover control device of a construction machine according to any one of claims 1 through 3, wherein:the selection member (35) is installed in the vicinity of the second operating member (34).
- A prime mover control device of a construction machine according to any one of claims 1 through 4, wherein:the actuator (5) is a traveling motor.
- A prime mover control device of a construction machine according to claim 5, further comprising:a determination means for determining a traveling state and a work state; wherein:when the traveling state is determined with the determination means, the first set means (41) is adapted to set the first set rotation speed to a larger value compared to a value to be set when the work state is determined.
- A prime mover control device of a construction machine according to claim 6, wherein:the determination means comprises a brake detection means (32) for detecting a non-operating state of a brake and a neutral detection means (33) for detecting a neutral operation of the first operating member, and adapted to determine the traveling state when the non-operating state of the brake and the neutral operation are detected.
- A wheeled hydraulic excavator, comprising:a hydraulic pump (24) driven by a prime mover (10);an actuator (5) driven with pressure oil discharged from the hydraulic pump (24);a control valve (25) for controlling a flow of the pressure oil from the hydraulic pump (24) to the actuator (5) in response to an operation of a first operating member (22a); anda prime mover control device according to any one of claims 1 through
Applications Claiming Priority (1)
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PCT/JP2002/009964 WO2004029434A1 (en) | 2002-09-26 | 2002-09-26 | Prime mover controller of construction machine |
Publications (3)
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EP1550803A1 EP1550803A1 (en) | 2005-07-06 |
EP1550803A4 EP1550803A4 (en) | 2007-04-25 |
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EP (1) | EP1550803B1 (en) |
JP (1) | JP3936364B2 (en) |
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Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3952994B2 (en) * | 2003-06-13 | 2007-08-01 | コベルコ建機株式会社 | Construction machinery |
JP4732126B2 (en) * | 2005-10-28 | 2011-07-27 | 株式会社小松製作所 | Engine control device |
JP4804137B2 (en) * | 2005-12-09 | 2011-11-02 | 株式会社小松製作所 | Engine load control device for work vehicle |
JP4945137B2 (en) * | 2006-01-26 | 2012-06-06 | 本田技研工業株式会社 | Walking type work machine |
JP4871760B2 (en) | 2007-02-28 | 2012-02-08 | 日立建機株式会社 | Motor speed control device for hydraulic drive vehicle |
JP4922881B2 (en) * | 2007-09-19 | 2012-04-25 | 株式会社小松製作所 | Engine control device |
US8463509B2 (en) * | 2008-03-21 | 2013-06-11 | Komatsu Ltd. | Working vehicle, control device for working vehicle, and control method for working vehicle |
KR100974279B1 (en) * | 2008-03-27 | 2010-08-06 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | travel system for heavy equipment |
SE532428C2 (en) * | 2008-05-29 | 2010-01-19 | Scania Cv Abp | Method for controlling the engine speed |
JP5249857B2 (en) * | 2009-05-29 | 2013-07-31 | 株式会社神戸製鋼所 | Control device and work machine equipped with the same |
JP5164933B2 (en) * | 2009-06-19 | 2013-03-21 | 日立建機株式会社 | Control device for work vehicle |
JP5204726B2 (en) * | 2009-06-19 | 2013-06-05 | 日立建機株式会社 | Motor vehicle control device for work vehicle |
GB2473631A (en) * | 2009-09-18 | 2011-03-23 | Valtra Oy Ab | Auxiliary hydraulic fluid pressure supply system in a tractor |
JP5588206B2 (en) * | 2010-03-19 | 2014-09-10 | 三菱農機株式会社 | Work vehicle |
US8362629B2 (en) * | 2010-03-23 | 2013-01-29 | Bucyrus International Inc. | Energy management system for heavy equipment |
US20130103272A1 (en) * | 2010-07-06 | 2013-04-25 | Volvo Construction Equipment Ab | Horsepower control system of a hybrid excavator and control method therefor |
US9097341B2 (en) * | 2012-01-26 | 2015-08-04 | Caterpillar Inc. | Brake system having a brake capacity test mode for a machine having a hydrostatic drivetrain |
CN103046610B (en) * | 2012-12-28 | 2015-09-02 | 三一重机有限公司 | A kind of walk signal checkout gear and walking machine |
EP2955281A4 (en) * | 2013-02-08 | 2017-01-25 | Volvo Construction Equipment AB | Construction equipment driving control method |
JP5920382B2 (en) * | 2014-02-28 | 2016-05-18 | コベルコクレーン株式会社 | Construction machinery |
JP6873809B2 (en) * | 2017-04-28 | 2021-05-19 | 株式会社クボタ | Work machine |
JP6837909B2 (en) * | 2017-04-28 | 2021-03-03 | 株式会社クボタ | Work machine |
WO2018199027A1 (en) * | 2017-04-28 | 2018-11-01 | 株式会社クボタ | Work equipment |
JP6682476B2 (en) * | 2017-06-29 | 2020-04-15 | 株式会社クボタ | Work machine |
CN109252970B (en) * | 2018-09-18 | 2021-09-28 | 潍柴动力股份有限公司 | Engine rotating speed control method, engine and vehicle |
CN110273767A (en) * | 2019-06-28 | 2019-09-24 | 三一汽车制造有限公司 | Control method, control system and the engineering machinery of dynamical system |
EP4320316A1 (en) * | 2022-02-08 | 2024-02-14 | Doosan Bobcat North America, Inc. | Power machine hand throttle and foot throttle control |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3595343A (en) * | 1969-01-15 | 1971-07-27 | Clark Equipment Co | Control system for lift trucks |
US3841423A (en) * | 1972-01-24 | 1974-10-15 | Clark Equipment Co | Hydrostatic propulsion system |
US3827522A (en) * | 1973-08-10 | 1974-08-06 | Koehring Co | Fluid pressure actuated brake light switch |
JPS60189642A (en) * | 1984-03-07 | 1985-09-27 | Toyoda Autom Loom Works Ltd | Controller for number of revolutions of prime mover in loading vehicle |
WO1990008263A1 (en) * | 1989-01-18 | 1990-07-26 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving unit for construction machinery |
JP2772540B2 (en) | 1989-04-12 | 1998-07-02 | 油谷重工株式会社 | Travel control device for wheeled excavator |
JPH03110150A (en) | 1989-09-26 | 1991-05-10 | Toppan Printing Co Ltd | Non-fogging film for food pakaging |
JPH085315Y2 (en) * | 1990-02-26 | 1996-02-14 | 株式会社アイチコーポレーション | Work vehicle accelerator control device |
JPH04143428A (en) | 1990-10-05 | 1992-05-18 | Komatsu Ltd | Controller for construction machinery |
US5307631A (en) | 1991-01-28 | 1994-05-03 | Hitachi Construction Machinery Co., Ltd. | Hydraulic control apparatus for hydraulic construction machine |
JP2634330B2 (en) | 1991-02-08 | 1997-07-23 | 日立建機株式会社 | Engine speed control device for hydraulically driven vehicle |
EP0528042B1 (en) * | 1991-02-05 | 1996-05-15 | Hitachi Construction Machinery Co., Ltd. | System for controlling revolution frequency of prime mover in hydraulically driven vehicle |
US5638677A (en) * | 1991-03-29 | 1997-06-17 | Hitachi Construction Machinery Co., Ltd. | Control device for hydraulically propelled work vehicle |
JP2884899B2 (en) | 1992-03-03 | 1999-04-19 | 油谷重工株式会社 | Running speed control method for construction machinery |
JP3487358B2 (en) | 1993-07-14 | 2004-01-19 | 株式会社小松製作所 | Engine power and hydraulic pump absorption horsepower control device of hydraulic excavator |
JP3654599B2 (en) * | 1994-09-09 | 2005-06-02 | 株式会社小松製作所 | Transmission device for hydraulic drive device and transmission control method therefor |
JPH0988650A (en) | 1995-09-14 | 1997-03-31 | Shin Caterpillar Mitsubishi Ltd | Engine speed switching device in working machine |
JP3351799B2 (en) * | 1996-08-09 | 2002-12-03 | 株式会社小松製作所 | Control device for engine and variable displacement hydraulic pump |
JPH1089111A (en) | 1996-09-17 | 1998-04-07 | Yanmar Diesel Engine Co Ltd | Control mechanism of engine loaded with working machine |
JP3511453B2 (en) * | 1997-10-08 | 2004-03-29 | 日立建機株式会社 | Control device for prime mover and hydraulic pump of hydraulic construction machine |
JP2864241B2 (en) * | 1997-12-22 | 1999-03-03 | 株式会社小松製作所 | Control equipment for construction machinery |
JP2000092949A (en) | 1998-09-22 | 2000-04-04 | Iseki & Co Ltd | Engine rotation control apparatus for agricultural working vehicle |
JP2000179372A (en) | 1998-12-15 | 2000-06-27 | Nissan Motor Co Ltd | Vehicle speed control device for forklift |
JP2001152921A (en) | 1999-11-19 | 2001-06-05 | Komatsu Ltd | Loading work vehicle |
JP2002003154A (en) | 2000-06-27 | 2002-01-09 | Hitachi Constr Mach Co Ltd | Device for setting maximum speed of hydraulic motor of construction machine |
JP4475767B2 (en) | 2000-08-03 | 2010-06-09 | 株式会社小松製作所 | Work vehicle |
US6938719B2 (en) * | 2000-09-08 | 2005-09-06 | Hitachi Construction Machinery Co., Ltd. | Speed control system for wheeled hydraulic traveling vehicle |
JP3686324B2 (en) | 2000-10-20 | 2005-08-24 | 日立建機株式会社 | Hydraulic traveling vehicle |
JP4015445B2 (en) | 2002-03-15 | 2007-11-28 | 日立建機株式会社 | Operation control device for wheel type construction machine |
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2002
- 2002-09-26 JP JP2004539436A patent/JP3936364B2/en not_active Expired - Lifetime
- 2002-09-26 CN CNB028296680A patent/CN100354512C/en not_active Expired - Lifetime
- 2002-09-26 DE DE60235125T patent/DE60235125D1/en not_active Expired - Lifetime
- 2002-09-26 WO PCT/JP2002/009964 patent/WO2004029434A1/en active Application Filing
- 2002-09-26 US US10/528,485 patent/US7886862B2/en not_active Expired - Fee Related
- 2002-09-26 EP EP02807861A patent/EP1550803B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1550803A1 (en) | 2005-07-06 |
JPWO2004029434A1 (en) | 2006-01-26 |
DE60235125D1 (en) | 2010-03-04 |
JP3936364B2 (en) | 2007-06-27 |
US7886862B2 (en) | 2011-02-15 |
US20060151230A1 (en) | 2006-07-13 |
CN100354512C (en) | 2007-12-12 |
EP1550803A4 (en) | 2007-04-25 |
WO2004029434A1 (en) | 2004-04-08 |
CN1668834A (en) | 2005-09-14 |
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